Northwest Africa 15341 (NWA 15341) Co3 Anomalous (Co3-An) Carbonaceous meteorite Found in January 2022 In Mali 5.36 grams This is only 1 of 4 meteorites ever to be classified as CO3 anomalous Carbonaceous meteorite. EXTREMELY RARE AND SCIENTIFICALLY VALUABLE METEORITE Classified and studied by world renowned and profoundly respected Dr Anthony J. Irving and team at Department of Earth and Space sciences, University of Washington. GUARANTEED AUTHENTICITY The authenticity of this meteorite is 100% guaranteed with a signed certificate For peace of mind rest assured you are buying directly from the main mass holder. Free first class express delivery and tracing will be provided. Meteoritical Bulletin database information: Northwest Africa 15341 Basic information Name: Northwest Africa 15341 This is an OFFICIAL meteorite name. Abbreviation: NWA 15341 Observed fall: No Year found: 2022 Country: Mali Mass: 1210 g Classification history: Recommended: CO3-an This is 1 of 4 approved meteorites classified as CO3-an. Comments: Approved 4 Apr 2024 Writeuphelp Writeup from MB 113: Northwest Africa 15341 (NWA 15341) Mali Purchased: 2022 Jan Classification: Carbonaceous chondrite (CO3-an) . Petrography: (A. Irving, UWS and J. Boesenberg, BrownU) Well-formed, relatively small chondrules (apparent diameter 230±170 µm, N = 26) containing glass or devitrified glass, plus some mineral fragments, AOA and very fine grained amoeboid CAI, are set in a fine grained matrix (~30 vol.%, red-brown in thin section) containing chromite, taenite, troilite and Cr-magnetite (associated with taenite and troilite). No kamacite was found. Geochemistry: Olivine (Fa23.1±20.4, range Fa0.7-56.1, N = 14; Cr2O3 in ferroan olivine 0.05-0.28 wt.%, mean 0.13 wt.%, sd 0.08 wt.%, N = 8), low-Ca pyroxene (Fs5.3±3.0Wo1.6±1.5, range Fs1.2-8.0Wo0.3-3.8, N = 4), diopside (Fs1.6±0.3Wo44.1±6.0, range Fs1.3-1.8Wo39.8-48.3, N = 2), Al-Ti-diopside in CAI (Fs1.7Wo50.2; Fs0.9Wo54.4; Al2O3 5.6-10.9 wt.%, TiO2 0.2-1.4 wt.%; N = 2), magnetite (Cr2O3 1.8-13.1 wt.%, N = 11). Classification: Carbonaceous chondrite (CO3, anomalous). Although magnetite is present in some low subtype CO3 chondrites. ( Rubin and Li, 2019), it is relatively Cr-poor (containing < 1 wt.% Cr2O3). The occurrence of relatively Cr-rich magnetite (containing up to 13 wt.% Cr2O3) as found in this specimen has not been previously reported in CO3 chondrites. Bibliography: Rubin A. E. and Li Y. (2019) Formation and destruction of magnetite in CO3 chondrites and other chondrite groups. Geochemistry 79, 125528. (Link) Data from: MB113 Table 0 Line 0: Place of purchase: Mali Date: P 2022 Jan Mass (g): 1210 Pieces: many Class: CO3-an Shock stage: S2 Weathering grade: low Fayalite (mol%): 23.1±20.4 Ferrosilite (mol%): 5.3±3.0 Wollastonite (mol%): 1.6±1.5 Classifier: A. Irving, UWS, and J. Boesenberg, BrownU Type spec mass (g): 27.0 Type spec location: UWB